I'm with you. I've never had an active account on StackOverflow. I created an account once or twice after coming across a question where the "accepted" answer was incorrect, or where it was badly missing something about the big-picture, and I was appalled to find that they don't let new accounts answer questions -- you have to comment or upvote (or something?) before you gain the right to answer a question.

Fuck that. I'm not going to waste my time farming karma for the privilege of answer questions for complete strangers that I happen to know the answer to. The moderation on stackoverflow is a complete mess -- it reminds me of the powertripping that you see on Wikipedia, but maybe even worse because there's far less room for interpretation when most of the questions are technical in nature.